Some examples from the market we are looking in.
1. Flat fixed fee and refunds extra: https://arrivva.com/
2. Minimum 1.25-1.5% but refunds 50% of any commission paid above: https://www.walawrealty.com/buy
Minimum for me to work with a company is transparent pricing. Even a range based on levels of service is cool. But, I am not going to waste time on a phone call with no clue as to fee structure.